US4094241A - Perforated doctor roll - Google Patents

Perforated doctor roll Download PDF

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Publication number
US4094241A
US4094241A US05/716,687 US71668776A US4094241A US 4094241 A US4094241 A US 4094241A US 71668776 A US71668776 A US 71668776A US 4094241 A US4094241 A US 4094241A
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United States
Prior art keywords
tube
ink
doctor
doctor roll
stencil
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US05/716,687
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English (en)
Inventor
Edgar Kossler
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Individual
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors

Definitions

  • the invention is concerned with a doctor roll arrangement comprising a tube revolving on its bedplate, especially for stencil printing.
  • doctors in the form of blades or rolls are used for forcing ink through the spaces or fine openings of flat or circular stencils, but also for direct application of viscous compositions onto a surface to be treated, for example the top surface of a moving web.
  • the intensity of color supplied, per unit of area, to the parts of the web to be printed on depends on the diameter of the doctor roll, the contact pressure thereof, and the viscosity of the color supply. Conditions are similar with doctor rolls that do not work in stencils but apply a viscous mass directly onto the surface to be treated.
  • Tubular doctors are known for some time (cf. U.S. Pat. No. 2,419,695). They have the advantage that their diameter can be made quite large compared with a solid roll of the same mass. A large roll diameter demands, however, high pressure on that portion of the inking substance that enters a wedge-shaped gap between the doctor roll and the surface on which it rolls. Such a higher pressure leads directly to the deposition of larger quantities of color in stencil printing and the length of the wedge-shaped gap promotes bleeding.
  • the ink deposit can be substantially increased if, in accordance with the invention, in the case of a tubular doctor roll, the roll is provided with recesses or gaps through which ink quantities to be deposited can enter from a stock or supply located in front of the tube, to be pressed into the interior of the tube.
  • FIGS. 1 through 5 are schematic cross sections through different inking attachments provided with doctor rolls and arrangements in accordance with the invention.
  • FIGS. 6 is a perspective view of a doctor roll according to the invention, inside an ink trough;
  • FIG. 7 is a cross section of the appliance of FIG. 6.
  • FIG. 1 An inking device or arrangement is illustrated in FIG. 1, comprising a doctor roll is constructed as an intrinsically rigid, hollow tube 1 revolving on the inside of a curved stencil 6. Tight contact of tube 1 onto stencil 6 is insured in the present case by means of a magnetic body 9, for which purpose tube 1 is made of magnetizable material such as nickel. Contact could also be made equally well by known mechanical or compressed-air means (not shown).
  • Ink feed is provided in front of tube 1 (toward the lefthand side of the drawing), on which account a supply of ink 4 is formed between same and stencil 6, continuing in the form of a wedge, somewhat of a drop shape, into the space between tube 1 and stencil 6.
  • ink 4 when the device is in operation, is not only squeezed from stock 4 onto web 7 carried on a machine blanket 8, but also a small stock of ink 4' is built up in the interior of tube 1. This results in an additional supply of ink arriving onto web 7 in the direct field of contact of tube 1 and stencil 6.
  • FIG. 2 differs from FIG. 1 chiefly in the fitting of an internal doctor in the form of a magnetic roll 5 made from magnetizable material.
  • both stocks of ink 4 and 4' lead to the formation of ink wedges, as shown.
  • the contact pressure of magnetic roll 5, which is pressed against the inside of tube 1 by magnetic body 9, affects first and foremost the impression depth of ink; there is, however, no simple relationship here, since for example with high nap or crepe fabrics the best print penetration is obtained with slight contact.
  • the second embodiment of FIG. 2 differs furthermore from that according to FIG. 1 also because the stencil is constructed as a flat stencil 6'.
  • the invention results in the advantage that ink stock 4 that exists in front of tube 1, at the end of the movement of the doctor, can proceed through gaps 2 of tube 1 onto the side of same lying there on the return movement.
  • FIG. 3 corresponds to the previous embodiments except for the use of a curved stencil 6, as in FIG. 1. Otherwise, the arrangement is similar to that of FIG. 2.
  • the internal doctor itself is a perforated hollow tube 1 which thus reinforces the effect due to the invention.
  • the internal doctor itself is a perforated hollow tube 1 which thus reinforces the effect due to the invention.
  • tube 1 the dimensions of tube 1, the size of gaps 2, and the number of holes per unit of area can be varied within comparatively broad limits.
  • FIGS. 6, 7 illustrate a tube according to the invention (that is, to any one of the embodiments), lying in an ink trough 20. It is carried in guide grooves 21 bilaterally in each of the end walls of trough 20. The trough rests on the stencil over packing washers 22. It will be understood that FIG. 7 illustrates an internal arrangement similar to that of FIG. 2, but the ink-trough combination can of course make use of any of the inventive embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Screen Printers (AREA)
US05/716,687 1975-08-29 1976-08-23 Perforated doctor roll Expired - Lifetime US4094241A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
OE6665/75 1975-08-29
AT666575A AT337644B (de) 1975-08-29 1975-08-29 Rakelrolle, insbesondere fur den schablonendruck

Publications (1)

Publication Number Publication Date
US4094241A true US4094241A (en) 1978-06-13

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ID=3588585

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/716,687 Expired - Lifetime US4094241A (en) 1975-08-29 1976-08-23 Perforated doctor roll

Country Status (4)

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US (1) US4094241A (de)
AT (1) AT337644B (de)
BR (1) BR7605625A (de)
DE (1) DE2630187A1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414915A (en) * 1982-03-22 1983-11-15 Armstrong World Industries, Inc. Rotary screen squeegee rod
GB2172851A (en) * 1985-02-14 1986-10-01 Gerald Hallworth Applying coating to uneven surfaces
EP0315466A2 (de) * 1987-11-06 1989-05-10 The Dow Chemical Company Herstellung von biegsamen Laminaten
US4943451A (en) * 1985-05-08 1990-07-24 Johannes Zimmer Process and device for applying a flowable substance to a surface
US4955298A (en) * 1987-06-03 1990-09-11 Johannes Zimmer Roller doctor or squeegee apparatus for applying fluid material to a substrate
US4993352A (en) * 1987-10-10 1991-02-19 Johannes Zimmer Squeegee device
US5022948A (en) * 1988-06-16 1991-06-11 The Dow Chemical Company Method of bonding layers using discrete areas of adhesive
US6217707B1 (en) 1996-12-31 2001-04-17 Kimberly-Clark Worldwide, Inc. Controlled coverage additive application
US6231719B1 (en) 1996-12-31 2001-05-15 Kimberly-Clark Worldwide, Inc. Uncreped throughdried tissue with controlled coverage additive
US20110079156A1 (en) * 2008-04-11 2011-04-07 O-PAC S.r.l. SOCIETÀ A SOCIO UNICO Machine for the in-line transformation of single-use products, heat-printed with coloured waxed and paraffins

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8713787U1 (de) * 1987-06-03 1988-09-29 Zimmer, Johannes, Klagenfurt, Kärnten Einrichtung zum Auftragen fließfähiger Substanzen in Druck- und Beschichtungsmaschinen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772711A (en) * 1951-06-15 1957-04-17 Chambon Ltd Improvements in or relating to squeegees for screen and stencil printing
DE2101085A1 (de) * 1970-01-21 1971-10-07 Zimmer, Peter Kufstein, Tirol (Osterreich) Rakelrolle
US3718117A (en) * 1971-04-26 1973-02-27 Armstrong Cork Co Grooved rod coater
US3845712A (en) * 1970-11-27 1974-11-05 Armstrong Cork Co Screen printing method
US3965817A (en) * 1973-04-03 1976-06-29 Zeki Ipek Closed squeegee applicator with flexible sides

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB772711A (en) * 1951-06-15 1957-04-17 Chambon Ltd Improvements in or relating to squeegees for screen and stencil printing
DE2101085A1 (de) * 1970-01-21 1971-10-07 Zimmer, Peter Kufstein, Tirol (Osterreich) Rakelrolle
US3845712A (en) * 1970-11-27 1974-11-05 Armstrong Cork Co Screen printing method
US3718117A (en) * 1971-04-26 1973-02-27 Armstrong Cork Co Grooved rod coater
US3965817A (en) * 1973-04-03 1976-06-29 Zeki Ipek Closed squeegee applicator with flexible sides

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414915A (en) * 1982-03-22 1983-11-15 Armstrong World Industries, Inc. Rotary screen squeegee rod
GB2172851A (en) * 1985-02-14 1986-10-01 Gerald Hallworth Applying coating to uneven surfaces
US4752510A (en) * 1985-02-14 1988-06-21 Gerald Hallworth Coating surfaces
GB2172851B (en) * 1985-02-14 1989-06-14 Gerald Hallworth Coating surfaces
AU590252B2 (en) * 1985-02-14 1989-11-02 Dow Chemical Company, The Coating surfaces
US4943451A (en) * 1985-05-08 1990-07-24 Johannes Zimmer Process and device for applying a flowable substance to a surface
US4955298A (en) * 1987-06-03 1990-09-11 Johannes Zimmer Roller doctor or squeegee apparatus for applying fluid material to a substrate
US4993352A (en) * 1987-10-10 1991-02-19 Johannes Zimmer Squeegee device
EP0315466A3 (en) * 1987-11-06 1989-12-06 The Dow Chemical Company Formation of flexible laminates
EP0315466A2 (de) * 1987-11-06 1989-05-10 The Dow Chemical Company Herstellung von biegsamen Laminaten
US4978402A (en) * 1987-11-06 1990-12-18 The Dow Chemical Company Formation of flexible laminates by bonding a backing to a pre-coated substrate
AU617705B2 (en) * 1987-11-06 1991-12-05 Dow Chemical Company, The Formation of flexible laminates
US5022948A (en) * 1988-06-16 1991-06-11 The Dow Chemical Company Method of bonding layers using discrete areas of adhesive
US6217707B1 (en) 1996-12-31 2001-04-17 Kimberly-Clark Worldwide, Inc. Controlled coverage additive application
US6231719B1 (en) 1996-12-31 2001-05-15 Kimberly-Clark Worldwide, Inc. Uncreped throughdried tissue with controlled coverage additive
US20110079156A1 (en) * 2008-04-11 2011-04-07 O-PAC S.r.l. SOCIETÀ A SOCIO UNICO Machine for the in-line transformation of single-use products, heat-printed with coloured waxed and paraffins
US8875627B2 (en) * 2008-04-11 2014-11-04 O-Pac S.R.L. Societa A Socio Unico Machine for the in-line transformation of single-use products, heat-printed with coloured waxes and paraffins

Also Published As

Publication number Publication date
AT337644B (de) 1977-07-11
DE2630187A1 (de) 1977-03-10
BR7605625A (pt) 1977-08-09
ATA666575A (de) 1976-11-15

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